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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
I agree that active/reserve is a better way of saying it, and that's the way I've always said it when working with these systems. Honestly I may have never heard master slave in actual use in 15 years of regularly describing such systems.